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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 436 (ENGINE PERFORMANCE SYSTEM REMOVAL & INSTALLATION)IGNITION SYSTEMSIGNITION COILREMOVAL (4.3L)
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal (4.3L)

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal (4.3L)
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect negative battery cable. Remove air cleaner assembly. Disconnect harness connectors from ignition coil. Slightly twist ignition coil wire at ignition coil. See Fig 1. Remove ignition coil wire at ignition coil by pulling on the wire boot.
  2. Remove accelerator control cable bracket from intake manifold. See Figure. Remove ignition coil mounting studs. See Fig 2.
  3. Remove ignition coil assembly. Drill and punch out the 2 rivets holding the ignition coil to the bracket. Remove ignition coil from bracket.
Fig 1: Removing/Installing Ignition Coil Wire (4.3L)
G00143828Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.